It’s called Install OS X Yosemite.app and it should have been downloaded to your main Applications folder (/Applications). Once you’ve downloaded Yosemite, find the installer on your Mac.Right-click (or Control+click) the Yosemite installer to view its contents. The procedure is a bit more involved with Yosemite than it was for Mavericks (which was itself a bit more involved than under Mountain Lion and Lion). Here are the steps for using it to create your installer drive.
You’ll find Disk Utility, a handy app that ships with OS X, in /Applications/Utilities. If you like, you can rename the drive from its default name of Install OS X Yosemite, though I think it’s kind of a catchy name. You now have a bootable Yosemite install drive.
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(see the screenshot above), which could take as long as 20 or 30 minutes, depending on how fast your Mac can copy data to your destination drive. Wait until you see the text Copy Complete. The program then tells you it’s copying the installer files, making the disk bootable, and copying boot files.
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Type your admin-level account password when prompted, and then press Return.
Paste the copied command into Terminal and press Return. Warning: This step will erase the destination drive or partition, so make sure that it doesn’t contain any valuable data.Launch Terminal (in /Applications/Utilities).Sudo /Applications/Install OS X Yosemite.app/Contents/Resources/createinstallmedia -volume /Volumes/Untitled -applicationpath /Applications/Install OS X Yosemite.app -nointeraction Select the text of this Terminal command and copy it:.This means that if you moved it before installing Yosemite, you need to move it back before making your installer disk. (The Terminal command used here assumes the drive is named Untitled.) Also, make sure the Yosemite installer, called Install OS X Yosemite.app, is in its default location in your main Applications folder (/Applications). Connect to your Mac a properly formatted 8GB (or larger) drive, and rename the drive Untitled.Using the createinstallmedia command in Terminal Here are the required steps: (Note that the createinstallmedia tool doesn’t work under OS X 10.6 Snow Leopard-it requires OS X 10.7 Lion or later.) The createinstallmedia method is the easiest if you’re at all comfortable using Terminal, it’s the approach that I recommend you try first. I’ve come up with three ways you can create a bootable OS X install drive for the Yosemite: using the installer’s built-in createinstallmedia tool using Disk Utility or performing the Disk Utility procedure using Terminal. Create the Yosemite install drive: The options If you don’t, you’ll have to redownload the installer from the Mac App Store before you can create a bootable installer drive. If you plan to use that installer on other Macs, or-in this case-to create a bootable drive, be sure to copy the installer to another drive, or at least move it out of the Applications folder, before you install. As with the Mavericks installer, if you leave the Yosemite beta installer in its default location (in the main Applications folder) when you install OS X 10.10, the installer will delete itself after the installation finishes. Like all recent versions of OS X, Yosemite is distributed through the Mac App Store.
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